Hi, I have a 13 year old Rat Terrier named Que. He has been gagging for about 6 weeks. We don't board him but we do take him to a dog park along with his sister. He gags maybe 2/3 times a day for about 1 minute. At first I thought it was kennel cough but his sister does not have it. He went to his Vet about a week and a half ago and the Vet said his heart sounded good and strong other than a small heart murmur. He said he thought it might be bronchitis. He put him on Doxycycline 100ml for 14 days. He has about two days to go and it seems to be the same. Has anyone else experienced anything similar? It's Not Kennel cough and not heart worms. Advise would be appreciated. I've just started giving him honey, lemon juice and warm water 2-3 times a day starting today. I'm not sure what else to do to find out what this is and what's causing it.